8 Best Engine Assembly Lube Reviews & Buying Guide in 2020

If you are here to know about the best engine assembly lube then you are in the right place. We all know how important the engine oil is! It keeps the engine running smoothly. But the mass people don’t care about assembly lubricant. It’s because the assembly grease is not a concern of the end-users.

But if you are a mechanic who has to deal with troubleshooting the engines then you must be familiar with this. Replacing or rebuilding an engine is a crucial task. It is a matter of patience. The assembly grease is a very important factor in this process.

If you don’t use adequate and proper lubricants then the engine may fail even in the first shot. It may break some vital components of an engine. So, you should choose the assembly lube carefully. And, don’t ever use a cheap or non-compatible grease in the engine assembly for saving a few bucks.

I know it’s not an easy task for a beginner to choose the best possible grease. There are certain factors that you must consider while choosing it. Besides, you should have deep theoretical knowledge related to grease and engine.

But don’t worry about that. Here we have created a list of the best engine assembly lube available in the market. You can rely on any one of them based on your preference. Moreover, we also added a buying guide in the latter part. So that you can gain the basic knowledge for choosing the best one on your own.

Preview
Permatex 81950 Ultra Slick Engine...
COMP Cams 104 Engine Assembly Lube, 8...
Lucas Oil LUC10153 Assembly Lube - 8...
Red Line 80319 Liquid Assembly Lube, 12...
Sta-Lube SL3331 Extreme Pressure Engine...
Product
Permatex 81950 Engine Assembly Lube
COMP Cams 104 Engine Assembly Lube
Lucas Oil LUC10153 Assembly Lube
Red Line 80319 Liquid Assembly Lube
Sta-Lube SL3331 Engine Assembly Lube
Rating
Reviews
1,890 Reviews
45 Reviews
317 Reviews
137 Reviews
150 Reviews
Preview
Permatex 81950 Ultra Slick Engine...
Product
Permatex 81950 Engine Assembly Lube
Rating
Reviews
1,890 Reviews
Preview
COMP Cams 104 Engine Assembly Lube, 8...
Product
COMP Cams 104 Engine Assembly Lube
Rating
Reviews
45 Reviews
Preview
Lucas Oil LUC10153 Assembly Lube - 8...
Product
Lucas Oil LUC10153 Assembly Lube
Rating
Reviews
317 Reviews
Preview
Red Line 80319 Liquid Assembly Lube, 12...
Product
Red Line 80319 Liquid Assembly Lube
Rating
Reviews
137 Reviews
Preview
Sta-Lube SL3331 Extreme Pressure Engine...
Product
Sta-Lube SL3331 Engine Assembly Lube
Rating
Reviews
150 Reviews

1. Permatex 81950 Engine Assembly Lube

Who doesn’t know the name of Permatex? This is one of the pioneers in the lubricant industry. This Ultra Slick lube by Permatex is a great choice for the engine assembly.

I included this at the top position, not for the brand value. But for the real-life experience, I had with this product. This lube will protect the rotating elements of your engine just like a guardian angel.

No matter whether you are building an engine for the first time or changing a component. This thing works like a champ. The lubricant nicely clings with the metal surface and doesn’t run off easily.

The lubricant is not thick like grease. Rather it is a liquid with low viscosity. The relative density is lower than the water. This is why it provides smooth movements inside the engine components.

The manufacturer used all the high-quality ingredients. I didn’t find any ingredient in the spec sheet that does not comply with the engine OEMs. The compatibility is great with any type of engine.

The flashpoint of the lubricant is almost 550 degrees Fahrenheit. This is very convenient for this type of high-temperature application. But you should be careful while disposing of this lubricant to the environment. Because more than 15 percent of the mixture is hazardous to aquatic lives.

The oil comes with a plastic bottle with a regular threaded cap. I found this type of packaging quite useful. It ensures safety against any kind of leakage while transporting.

Overall, this lube for engine assembly is the best in this budget. Although if the viscosity would be a bit higher it would be a complete package. But I don’t think this should be a dealbreaker for you.

Pros

  • Provides great stability in high temperature.
  • The lube provides smooth movement between metal to metal contact points.
  • Comes with protective and recyclable packaging.
  • It has a relatively longer shelf life than any other lubricant.

Cons

  • The relative density could have been better.

2. COMP Cams 104 Engine Assembly Lube

This assembly lube from the COMP Cams is very popular among the veteran engine builders. Although the price is on the cheaper side. But don’t underestimate the ability of this amazing lubricant.

This lubricant is based on lithium complex. Lithium is great as a thickener in the grease. If you are familiar with the core concepts of lubricating agents then you might know this. The lithium complex provides extreme stability in high temperatures.

Since the engines always run on extreme temperature this is a very crucial factor. On top of that, you can easily clean up used lithium greases by using soap and water. This thing saves you from a lot of hassle.

The viscosity of this product is one of the best so far. I didn’t find any issues like running and dripping off from the parts. It can take good care of the valve trains and other small parts of the engine.

They added some additives to get the best output even under high pressure. This is probably the best motorcycle engine assembly lube out there.

The grease is a bit dry and you can feel the Zinc used in this lube while applying. But the metal to metal contact parts was moving smoothly. And I didn’t face any issues like abnormal sounds and friction.

Overall, this is a great product for budget buyers. If you are a professional engine builder who has to buy greases in a bulk amount then this is a great choice.

Pros

  • The price is very aggressive and the price to performance ratio is superb.
  • It provides enough mechanical stability under high pressure.
  • The compatibility with other regular lubricants is the most important feature.
  • The Zinc and Molybdenum add up extra strength to it.

Cons

  • The dryness might be irritating to those who are used to low viscosity greases.

3. Lucas Oil LUC10153 Assembly Lube

In the world of automobile lubricants, Lucas Oil is unbeatable. Although for some reason I had to mention this in third place. But that does not mean this assembly lube is bad in any manner.

Lucas Oil is marketing this product as a High-performance Semi-synthetic grease. This is because they have added some synthetic additives to get the most out of it. It is fortified with Zinc and Molybdenum that provide support in extreme conditions.

What I liked most about this grease is its unique minty smell. This thing will probably help a lot of those who can not tolerate the petroleum odor from the lubricants.

It shows great compatibility with other lubricants as well as oils. Because the grease is not compatible with engine oils it will clog up the engine. I didn’t find any of these issues with this lubricant.

Shelf life is another very important matter of a grease. You will get a longer shelf life with this lubricant. Most of the cheap lubricants become dry if you put on the shelf for a long period.

The specific gravity is 0.89 which is decent. It is not that dry and it will not run off from the parts. It adheres to the metal surface quite well.

Overall, this is a lubricant that you can go for if you want to stay on a safe side. The rust-free and anti-seize additives of this assembly lube is a bonus for your engine.

Pros

  • It can sustain extreme torque and tensional stress.
  • You can mix it up with all with no issues.
  • This grease has a very long shelf life and sustainability.
  • It provides good protection against rust and corrosion.

Cons

  • This lube is not that good in extreme temperature scenarios.

4. Red Line 80319 Liquid Assembly Lube

Red Line Oils is a popular name in the motorsport sector. They are well known for their high-performance oils and grease. They are targeting this product, especially towards motorsport professionals.

But as a general-purpose user, I found the results quite satisfactory. This is a liquid lubricant that comes in a well-built bottle. 

The main reason why we use assembly lube is to protect the components while starting up. This lubricant clings nicely to the surface and eliminates friction. The liquid has low viscosity and hence it reaches the deepest points of the engine.

FYI, I am used to highly viscous lubricants. This is why it seemed a little runny in my hands. But don’t worry about that. I didn’t find it dripping off from the engine.

This lube blends easily with the engine oil. This is why after the engine started up there was no clogging problem. The engine sound was quite satisfying.

By the way, this is not a traditional Molybdenum based grease. But the manufacturer is claiming a three times firmer strength than that. I think they have added some capable alternatives to moly.

But there is a big negative side to the grease. You can not use in high-temperature exhaust bolts and other fasteners. It’s because that needs an anti-seize which is absent in this grease. But otherwise, it is great in preventing rust and corrosion.

Pros

  • This grease does not plug engine filters which is very common during initial start-up.
  • The formula is specially made for the professional racers.
  • It can withstand a minimum of two years without causing any rust.
  • You can use this in any kind of camshaft and drivetrain.

Cons

  • You can not use this as an anti-seize compound.

5. Sta-Lube SL3331 Engine Assembly Lube

Unlike many other engine assembly lube, this thing comes in a small tube. It is because the viscosity of this lube is greater than the average. I liked the packaging it comes with.

As I was saying, it is enough thick. The credit goes to the Lithium-based thickener they added into it. This is why this lubricant adheres to the surface pretty well.

The working temperature range is wide and it can withstand high-temperature engine conditions. The manufacturer named it as an extreme pressure lubricant. I believe this thing will prove it in that condition.

Although it is intended to use as the coating inside the cylinder surface. But you can use it in other parts. Most of the professional mechanics use this for installing a hydraulic camshaft.

This lubricant is fortified with Molybdenum compounds and graphite. I like the anti-seize capability of this grease. Because many lube found in the market don’t work as an anti-seize.

The semi-solid physical appearance might create some confusion. Because normally the engine assembly lubricants come with liquid appearance. But this semi-solid nature is convenient for practical application.

The overall performance and value it provides are average. But you can not call it sub-par. So, if you want to buy this over others you can always do it. You won’t have to regret it.

Pros

  • The overall consistency of this lubricant is very well.
  • The evaporation rate is very low which is a plus point.
  • It stays on the metal surface for a long time even under extreme pressure.
  • You can easily remove it completely with normal degreasers.

Cons

  • I didn’t find any crucial demerits except the high-temperature usage.

6. Maxima Racing Oils 69-01904 Assembly Lube

This is yet another assembly lube made for the motor racing industry. But the general-purpose use is quite popular among the mass people. This is a great high-quality lubricant for building your engine.

The formula is enriched with Zinc additives. Zinc protects against rust and corrosion. Many assembly lubricants come without Zinc. Although this makes the grease smoother. But the engine will suffer in the long run.

I liked the packaging and user experience it provides. The bottle has a narrower opening like a nozzle. This thing makes it easy to apply the lubricant inside the engine parts.

No matter whether the engine oil is petroleum-based or synthetic. This grease blends easily with that. This is the most vital factor that we should consider while choosing an engine assembly lube.

It does surprisingly well in resisting frictions. Besides, the manufacturer added chemicals so that it can withstand extreme pressurized conditions.

Another interesting fact about this grease is that it smells like Cinnamon. It does not have anything to do with performance. But I liked that the manufacturers are paying attention to these small details.

Pros

  • It is fortified with many anti-seize and corrosion-resistant additives.
  • This grease is equipped with two times more Zinc power.
  • You will get smoother movements between the metal surfaces.
  • The non-foaming characteristic of this grease provides enough stability.

Cons

  • The grease is a bit runny and sometimes drips off.

7. Red Line RED80312 Assembly Lube

This is another great product from the Red Line Oils. There is not a huge difference between these two lubricants. The previous one was liquid in physical appearance. On the other hand, this one is more viscous.

This is for the persons who like thicker greases. I also like thick lubricants because they can be easily applied to the machinery.

It didn’t use Molybdenum Disulfide in the chemical formula. But it provides more stability than the moly greases. On top of that, the absence of moly provides you better protection against corrosion.

This grease can be applied to followers, bearings, pistons, and other mechanical components. Although it is better suited for camshaft and drivetrains.

Red Line assembly lube provides great stability even at very high temperature. It protects the metal surface of the engine parts from waring off by reducing friction.

If you don’t follow the method of the engine manufacturer then you might not get the expected results. I heard some people complaining about this lubricant. But honestly speaking, this is not that bad.

I got satisfactory results after using it. Moreover, it has all the characteristics of a good assembly lubricant.

Pros

  • There is a good balance between thickness and liquidity.
  • Works great in camshaft and other crucial components.
  • The strength of the grease remains constant even under extreme pressure.
  • The shelf life is enough long for using the remaining grease in the future.

Cons

  • Doesn’t do well against corrosion and rust as it should.

8. PJ1 SP-701 Spray Engine Assembly Lube

This engine assembly lube falls on the costlier side. But it provides excellent value. Although there are some cheaper alternatives to go for. This is on my list because I didn’t find anything to complain about on this lube.

The first run of the engine is a very crucial moment. Many engines fail in this state. This is because the builder didn’t provide high-quality lubricant inside the engine.

This grease is nourished with additives that provide extreme performance. Hence it protects the engine from failing in the initial startup.

The car modders and racecar mechanics are using this assembly lube for a long time. For general purpose use, I also recommend this lube if you are willing to spend some extra bucks.

The distinct feature of this grease is the packaging system. It comes in aerosol packaging. The spray mechanism helps the grease to reach in the deepest corners where a hand or nozzle can not reach out.

Those who are not used o using this spraying system might find it unsuitable. But once you are used to it, you can easily lube your engine like the champ.

This is not the best engine assembly lube in this list but the performance is not negligible either. If you want to try something different then it should be your pick.

Pros

  • You can use it in a wide range of parts and components.
  • Most of the specialists in the racing industry rely on this.
  • It provides great compatibility with engine oils.
  • The aerosol packaging is convenient for many users.

Cons

  • The spray formula might not be suitable for many mechanics.

Things To Consider For Buying Engine Assembly Lube - Buying Guide 

This is not always a good idea to stick to product reviews for making a decision. The demand for every person is different. If you know the core concepts of a particular product you can decide on your own.

For this reason, you must need to clear the concepts of engine assembly lube. The theories will help you to choose the best product for your need without looking at the user reviews.

I am not saying that this is the best process for choosing a product. But this will reduce the possibility of wasting your valuable money.

The engine assembly lubricant is one kind of grease. You have to understand how greases work to know better about assembly lube. Besides, you have to have some experience in this engine building process.

In a normal mechanical part, we can apply any kind of grease. But the parts of the engine are very important and delicate. Using a wrong grease can break any engine part and cost you a huge sum of money.

Here I am mentioning some characteristics of an engine assembly lube. The grease should contain these things to be the best engine assembly lube for 2 stroke engines.

Indeed, you will not find all the good aspects of a particular lubricant. In that case, you have to set the priority based on your knowledge and the OEM requirements of the engine.

Thickening agent:

This is the main component of liquid grease. This is also called the base of the grease. No matter whether the grease is paste-like or runny like water, there is a thickener added to it.

Most of the greases use Lithium complex or Calcium Sulfonate soaps as the thickeners. They determine the core characteristics if the grease. Normally the lithium-based grease has great mechanical stability and heat-resistance.

Solid contents:

For the high-pressure usages, the manufacturers add some solid contents to their greases. Moly is the most popular ingredient for this purpose. The element Molybdenum is used for making different compounds.

They provide great stability under extreme loads. But if there is more than 5% moly in the lubricant it might stick the small components. In the engine assembly lubricant, you must look for the amount of moly. If the amount is too high you should not consider buying it.

Physical appearance:

This is another important aspect of an engine assembly lube. They come in different physical appearances and states. Some are thick and they almost feel like paste. On the other hand, some lube is liquid like water.

There are some lubricants nowadays that come in spray bottles. You have to consider whether the physical aspects and appearance suit your needs or not. The comfort and user experience of the mechanic or engine builder is the main priority here.

Rust and corrosion:

Many high-quality greases have anti seize compounds added as additives. In that case, they will protect you from galling, seizing the engine parts.

Besides, you should look for the corrosion resistance additives in that grease. Normally, the engines are not affected by rust or corrosion. But you can stay on the safer side by using lubricants with protection against oxidation.

Compatibility:

The compatibility with oil and other lubricants is a very vital factor of assembly lube. When you start the engine for the first time, the engine oil will wash away most of the assembly lubricants.

But, if the lube is not compatible with engine oil it may create clogging and other hazards. This can be the reason for the engine failure. A good engine assembly lube is compatible with almost any type of engine oils and greases.

Frequently Asked Questions

Q. What can I use for engine assembly lube?

Although you can use just engine oil or any general-purpose grease as an assembly lube. But this is not recommended. There are many engine assembly lubricants in the market formulated by the experts. You should use any one of them to keep your engine safe and healthy.

Q. What is the engine assembly lube used for?

When you are repairing or building an engine from scratch, you must apply assembly lube. If you don’t do so the parts may fail as a part of the friction produced by them. The camshaft failure is very common during the initial startup of the engine. This is why the engine builders and mechanics use this in engines.

Q. Do you put assembly lube on rod bearings?

Yes, this is a very common practice to put engine assembly lubricant on rod bearings. Not only that, but you should also apply the assembly lube on any kind of surface inside the engine. Otherwise, the engine may fail due to excessive friction.

Q. What is an engine assembly lube made of?

The assembly lube consists of various chemical ingredients mixed in an adequate proportion. The main components are - thickeners like Lithium, solid contents like Molybdenum, some additives, and petroleum compounds.

Q. Is a rebuilt engine as good as new?

This is a tricky question. We should take some factors under consideration for answering this. But in most cases, the rebuilt engine can perform as good as a brand new engine built by the OEMs. It all depends on how carefully you built the engine!

Final Words

Rebuilding an engine is a long and tiresome process. You can make your car feel like a brand new by rebuilding it. But it should be done by an expert engine builder.

Since the assembly lube is a part and parcel of the engine building process, you should give attention to it. Otherwise, your car won't give you a smooth ride. I hope this article has helped you learn the concepts so that you can choose the best engine assembly lube.

Leave a Comment: